Pro Grip 842 Gel Duo Density Cruiser Grip - 1"/Black RVGS: Reduced Vibration Gel System - all gel on the outside. The softness of Gel and the strength of duo density. Grey base against the bar (37 shore). Exterior in gel for soft, ergonomic fit (15 shore) - made from the same high-tech rubber compounds used in Formula One racing cars. Super soft and super durable with great adhesion. Patented process co-molds the RVGS in the grip.